Bulk Phase Relations, Conductivity, and Transparency in Novel Bixbyite Transparent Conducting Oxide Solution in the Cadmium-Indium-Tin Oxide System

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A novel transparent conducting bixbyite solid solution In2-2x(Cd,Sn)2xO3 (0 <x <0.34 at 1175°C) has been discovered. Four-point dc-conductivity varies widely with x and the [Sn]/[Cd] ratio with a maximum in excess of 1800 S/cm (x = 0.05, [Sn]/[Cd] = 9) and a minimum too low to be measured (x = 0.05, [Sn]/[Cd] = 0). The optical gap measured along the line In2-2xCdxSnxO3 remains constant near 3 eV while transparency decreases with increasing x possibly because of free carrier absorption. Four-point dc-conductivities measured from biphasic samples prepared by varying the [Sn]/[Cd] ratio suggest that the solution extends between the CdO-In2O3 and SnO2-In2O3 binaries for small x. As x increases, the solution width decreases and is found to exist only over a small range of [Sn]/[Cd] ratios slightly greater than unity near x = 0.34. Single-phase bixbyite samples subjected to a reduction anneal showed increased conductivity and slightly higher optical gaps, possibly as a consequence of the Moss-Burstein shift. The ratio of the reduced to as-fired conductivities for specimens prepared along the line In2-2xCdxSnxO3 decreased with increasing x. This suggests that for small x electrons are generated by oxygen vacancies while at larger x the electron population is fixed by a Sn excess (i.e., [Sn]/[Cd] > 1).

Original languageEnglish
Pages (from-to)1004-1009
Number of pages6
JournalJournal of the American Ceramic Society
Issue number5
Publication statusPublished - May 2001


ASJC Scopus subject areas

  • Ceramics and Composites

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